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21597 (1998 WA8)
Classification: Main-belt Asteroid          SPK-ID: 2021597
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0740350641528344 7.1075e-08  
a 3.018376293049162 4.4718e-08 AU
q 2.794910610555872 2.0664e-07 AU
i 11.25674534562611 9.7538e-06 deg
node 60.08902826593074 4.4419e-05 deg
peri 231.6563862942083 9.5839e-05 deg
M 142.8534740514935 8.1794e-05 deg
tp 2456240.441877913078
(2012-Nov-08.94187791)
0.00043979 JED
period 1915.395658159922
5.24
4.2566e-05
1.165e-07
d
yr
n .187950723635786 4.1768e-09 deg/d
Q 3.241841975542451 4.8029e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      829  
   data-arc span      6729 days (18.42 yr)  
   first obs. used      1996-05-16  
   last obs. used      2014-10-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5079  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Nov-10 13:39:00  

Additional Information
 Earth MOID = 1.79613 AU 
 T_jup = 3.214 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.2 mag n/a MPO266069  

21597 (1998 WA8)          Discovered 1998-Nov-18 by Ueda, S., Kaneda, H. at Kushiro (399)
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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